Improvement in mechanical movements



'VUN'ITED STATES 4PATENT L OFFICE.

ROBERT I3. DAVIDSON, OF GREENVILLE, KENTUCKY.

IMPROVEMENT MECHANICAL MOVEMENTS.

Specilication forming part of Letters Patent No. 39,891 dated September 15, 1863.

To all whom it may concern Be it. known that I, ROBERT B. DAVIDSON, ot' Greenville, in the county of Muhlenburg and State of Kentucky, have invented a certain new and improved mechanical movement or device for transmitting motion to machinery; and I do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of the invention, some parts of the external frame being broken away. Fig. 2 is an end elevation of the same. Fig. 3 is'a plan thereof.

Similar letters of reference indicate corresponding parts in the several views.

The subject of my invention is an arrangement of levers, toggles, and other mechanism,

`whereby a reciprocating motion from a steamengine or other motor may be converted into a continuous or intermittent rotary motion with great force. L l

To enable others skilled in the art to which my invention appertains to fully understand and use the same, I will proceed to describe its construction and operation. y

A A A represent various parts of a strong frame.

B is a pendent lever, fulcrnmed at b in the said frame. To the lower end of this lever is attached a pitman or connecting-rod, C, from the prime motor.

D E F are levers fulcrumed in the main frame at d cf, respectively.

G is a connecting-rod, pivoted at one end to the upper or free end of theV lever D, and at its other end to the upper end of a floating lever, H, whose lower end is connected to the primary lever B by a rod, I. A link, J, connects an intermediate part of the floating lever H with the upper end of the lever E.

K is a rigid and L a jointed rod, which are pivoted to the lever F, one above and the other below its fulcrum. The said rods are also pivoted to a lever, M, which is supported by a pin, m, in a segmental guideslot, e', in the lever E. The jointed rod L extends backward beyond the lever F, and forward beyond the lever M, carrying at its forward end a pawl, N, and at its rear end, back of the lever F, a roller, o. l l l o2 is a similar roller at the upper end of the lever M, above its attachment to the rod K.

O isa chain, attached at o to the main frame,

passing around the rollers o o2, and attached at its upper end to the lever D.

I) is a rigid rod, jointed at its rear end to the lever F, between its fulcrum f and the attachment of the jointed rod L, and at its forward end to the upper end of the pawl N, which projects above the rod L.

It represents a ily-wheel secured upon a shaft, r, and S is a ratchet-wheel upon the same shaft, through the medium of which the reciprocating motion of the pawl N is made to rotate the wheel R in a continuous direction.

a is a weight, serving to throw the pawl into gear with the ratchet-wheel. The wheel It may be used as a pulley to impart motion to a driving'belt, or it may be furnished with cogs-radial, beveled, longitudinal, or of any suitable form.

Operation: In Fig. l the parts are represented approaching '.he end of their backward stroke. A further backward movement of the rod C, acting through the levers B, E, and M and jointed rod L, will draw back the lower end of the pawl, ready to take into the tooth of the ratchet-wheel immediately below it. It will now be apparent that if the rod O be drawn forward, acting through the medium of the levers and connections hereinbefore described,it will force the pawl N downward by means of the pin m, working in the slot o', and the wheel R will thus be rotated in the direction indicated by the arrow. Ihe combined action of the rods L and P, controlled by the chain O and the various connections, during the'downward motion of the pawl N presses its lower end forward in such a manner as to cause it to continue to act in a tangential direct-ion upon the wheel. This is an important and peculiar feature of my invention, and causes the power applied to act to the greatest possible advantage. It possesses an additional ladvantage in having no dead-point, as in the case of a crank. When greater speed is desired, a ropeor rod may be attached directly to the eye, (shown by dotted lines at thelower end of the lever F.)

The invention is applicable to locomotive purposes where great power is required with little speed, asin many agricultural and en gineeringimplements Ials0,to drawn g stumps, raising heavy Weights, and various other uses. For propelling canalfboats it may be used With great advantage with large paddle-Wheels moving at low speed, and the intermittent motion Will form an additional security against Washing the banks.

Having fully described my invention, what I claim as ner therein, and desire to secureA by Letters Patent, is-

A combination of levers B, D, E, F, and M,

and connecting-rods G, I, K, L, ad P with a chain, cord, or band, 0, paWl, N, and ratchet- Wheel, S, all as herein described.

` The above specification of my improved mechanical movement signed this 13th day of June, 1863.

ROBT. B. DAVIDSON. 

